It would be devastating with both
Conscript army and
Elemental storm since you can position them to replace practically your opponent's entire hand.
You could also use it to duplicate Durable cards that have different effects when New such as
Hungry dead and
Moat to allow you to always play the second effect, though that can already be done with existing cards and position in hand doesn't matter.
This would replace
Archmage in at least one of my decks. I don't know if this is a good thing or bad. It just seems too easy.